User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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DWord Bits Description
0 31:29 Client : 03h – Rendering Engine
28:24 3DStateMWNP (Non-pipelined) : 1Dh
23:16 Opcode : 80h
15:0 DWORD_LENGTH : 3
1 31 Drawing/Scissor Rectangle clipping Enable (for validation purpose only). This bit
should be set to enable in normal mode.
0 = Enable
1 = Disable
30:28 Reserved: 00h
27:26 X Bias: A 2-bit value of x bias for dithering compensation
25:24 Y Bias: A 2-bit value of y bias for dithering compensation
23:0 Reserved: 00h
2 31:16 Clipped DR Ymin: Y coordinate of upper left corner of drawing rectangle after being
clipped to screen boundary. Only the lower 10 bits in U10 format is used by hardware.
This value is a pixel-aligned, unsigned integer, and reference to the upper-left corner
of the 2D buffer defined in the dest buffer info packet.
15:0 Clipped DR Xmin: X coordinate of upper left corner rectangle after being clipped to
screen boundary. Only the lower 11 bits in U11 format is used by hardware. This
value is a pixel-aligned, unsigned integer, and reference to the upper-left corner of the
2D buffer defined in the dest buffer info packet.
3 31:16 Clipped DR Ymax: Y coordinate of lower right corner rectangle after being clipped to
screen boundary. Only the lower 10 bits in U10 format is used by hardware. This
value is a pixel-aligned, unsigned integer, and reference to the upper-left corner of the
2D buffer defined in the dest buffer info packet.
15:0 Clipped DR Xmax: X coordinate of lower right corner rectangle after being clipped to
screen boundary. Only the lower 11 bits in U11 format is used by hardware. This
value is a pixel-aligned, unsigned integer, and reference to the upper-left corner of the
2D buffer defined in the dest buffer info packet.
4 31:27 Reserved
26:16 DR origin Y: Origin of the Y coordinate of the drawing rectangle before being clipped
to screen boundary. The value is S10 in 2’s complement format. This value is a pixel-
aligned, and reference to the upper-left corner of the 2D buffer defined in the dest
buffer packet.
15:12 Reserved
11:0 DR origin X: Origin of the X coordinate of the drawing rectangle before being clipped
to screen boundary. The value is S11 in 2’s complement format. This value is a pixel-
aligned, and reference to the upper-left corner of the 2D buffer defined in the dest
buffer packet.